PWM To analog

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JAPIB

Post subject: PWM To analog

PostPosted: Thu Jun 14, 2018 3:56 pm

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Joined: Sun Apr 15, 2007 1:18 am
Posts: 153

Hello,

Has anyone ever written a program to convert PWM pulses to analog value?
If yes can you explain to me the principle.
I looked at OSCAT, but I did not find !

Thank you in advance
Best regard

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somlioy

Post subject: Re: PWM To analog

PostPosted: Thu Jun 14, 2018 5:26 pm

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You have a constant frequency usually, then you know the total time between first rising edge to second rising edge:

T = 1/f.

Period can also be calculated and averaged in software if frequency is not known.

Then you check the length of the on-pulse and then for example get the percentage on-time from total periode-time.

Or even easier, use a first or second order low-pass filter and get an analog voltage.

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JAPIB

Post subject: Re: PWM To analog

PostPosted: Fri Jun 15, 2018 11:16 am

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Thanks a lot somlioy , I'll try this soon.

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